121821043 has 2 divisors, whose sum is σ = 121821044. Its totient is φ = 121821042.

The previous prime is 121821001. The next prime is 121821053. The reversal of 121821043 is 340128121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (340128121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121821043 is a prime.

It is not a weakly prime, because it can be changed into another prime (121821053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60910521 + 60910522.

It is an arithmetic number, because the mean of its divisors is an integer number (60910522).

Almost surely, 2^121821043 is an apocalyptic number.

121821043 is a deficient number, since it is larger than the sum of its proper divisors (1).

121821043 is an equidigital number, since it uses as much as digits as its factorization.

121821043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 121821043 is about 11037.2570414936. The cubic root of 121821043 is about 495.7249426106.

Adding to 121821043 its reverse (340128121), we get a palindrome (461949164).

It can be divided in two parts, 12182 and 1043, that added together give a square (13225 = 115²).

The spelling of 121821043 in words is "one hundred twenty-one million, eight hundred twenty-one thousand, forty-three".